Instead of letters

Foster children write letters only when their foster parents write them.  Applying this correspond system indicates that the foster parents who are poor correspondents will not receive letters from their children any more.  Surely there will be some parents who don’t write by themselves but still look forward to hear from their children.  However, they can get children’s writing works instead of simple letters from now on.  Depending on a theme of essay, parents will gain more detail pictures of children’s lives.